Effective dispersion of aqueous clay suspension using carboxylated nanofibrillated cellulose as dispersant

Ming, Siyi; Wu, Zhenfu; Su, Lingfeng; He, Jiahao; Kuang, Yudi; Fang, Zhiqiang

doi:10.1039/c6ra03935a

Cited by 15 publications

(10 citation statements)

References 46 publications

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“…Strong negatively charged COO – groups were introduced to the surface of NFC in this process. Meanwhile, it is known that NFC is an amphiphilic material owing to the presence of hydrophobic C–H moieties and hydrophilic O–H groups on the cellulose molecular chain. , NFC can interact with CNTs through the hydrophobic sites of CNTs and specific crystalline faces (hydrophobic (200) planes) of NFC. As a result, the electrostatic repulsive forces provided by COO – groups and the hydrophobic interaction between NFC and CNTs facilitate the dispersion of CNTs in NFC solution.…”

Section: Resultsmentioning

confidence: 99%

Flexible and Highly Sensitive Humidity Sensor Based on Cellulose Nanofibers and Carbon Nanotube Composite Film

et al. 2019

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Flexible and highly sensitive humidity sensors are crucial for humidity detection. In this study, a flexible cellulose nanofiber/carbon nanotube (NFC/CNT) humidity sensor with high sensitivity performance was developed via fast vacuum filtration. CNTs were well dispersed in water by using 2,2,6,6-tetramethylpiperidinyl-1-oxyl (TEMPO)-oxidized NFC as a dispersant. More importantly, NFC also acted as a humidity sensitive material, achieving superior performance of NFC/CNT humidity sensors. The obtained NFC/CNT humidity sensor with 5 wt % CNT loading exhibits outstanding sensitive performance, and its response value reaches a maximum of 69.9% (ΔI/I 0) at 95% relative humidity (RH). It also displays good bending resistance and long-term stability. In addition, the NFC/CNT humidity sensor was employed to monitor human breath. Therefore, we believe that the flexible, highly sensitive, and simply designed NFC/CNT humidity sensor is a promising candidate for various applications in the field of humidity measurement.

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Section: Resultsmentioning

confidence: 99%

Flexible and Highly Sensitive Humidity Sensor Based on Cellulose Nanofibers and Carbon Nanotube Composite Film

et al. 2019

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“…The TCF is related to the apparent hydrodynamic radius (particle diffusivity), which suggests that HCNFs adsorb onto the bentonite particles (Ferse et al 2008). Indeed, previous work has shown that cellulose nanoparticles and cellulose-based polymers can be used to disperse clays in water (Ming et al 2016;Sjöberg et al 1999). Figure 8 shows a schematic illustration of the interactions and shear-dependent microstructure of composite dispersions of CNF and bentonite or sepiolite.…”

Section: Resultsmentioning

confidence: 99%

“…Notably, it has been shown that CNF-bentonite dispersions display properties suitable for use as drilling fluids (Li et al 2015). However, comprehensive studies on the steady-shear and viscoelastic properties of such CNF-nanoclay dispersions are rare, and previous rheological studies have mainly focused on dispersions of plate-like nanoclays and moderately charged or uncharged nanocellulose particles (Abend and Lagaly 2000;Li et al 2015;Ming et al 2016;Nechyporchuk et al 2014).…”

Section: Introductionmentioning

confidence: 99%

Steady-shear and viscoelastic properties of cellulose nanofibril–nanoclay dispersions

2017

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We have investigated the steady-shear and viscoelastic properties of composite dispersions of cellulose nanofibrils (CNFs) with medium or high charge density and two different nanoclays, viz. rodlike sepiolite or plate-like bentonite. Aqueous dispersions of CNFs with medium charge density displayed significantly lower steady-state viscosity and storage modulus but higher gelation threshold compared with CNFs with high charge density. Dynamic light scattering (DLS) results showed that the apparent hydrodynamic radius of bentonite particles increased when CNFs were added, implying that CNFs adsorbed onto the amphoteric edges of the plate-like bentonite particles. The sepiolite network in CNF-sepiolite dispersions was relatively unaffected by addition of small amounts of CNFs, and DLS showed that the hydrodynamic radius of sepiolite did not change when CNFs were added. Addition of CNFs at concentrations above the gelation threshold resulted in drastic decrease of the steady-shear viscosity of the sepiolite dispersion, suggesting that the sepiolite network disintegrates and the rod-like clay particles are aligned also at low shear rate. The relative change in the rheological properties of the clay-based dispersions was always greater on addition of CNFs with high compared with medium charge density. This study provides insight into how the rheology of CNFnanoclay dispersions depends on both the nanoclay morphology and the interactions between the nanoclay and nanocellulose particles, being of relevance to processing of nanocellulose-clay composites.

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“…A drop of the cellulose fiber suspension after bleaching was placed on a glass slide for imaging with an optical microscope (OLYMPUS BX51). A drop of CNC suspension was placed on a piece of freshly cleaved mica, dried and then analyzed with Atomic Force Microscope (AFM, Nanoscope IIIa Multimode 8, Bruker) 42 . Lengths and diameters were obtained using the section analysis tool of the NanoScope Analysis software (Bruker, version 1.40) from height mode AFM image.…”

Section: Methodsmentioning

confidence: 99%

A full utilization of rice husk to evaluate phytochemical bioactivities and prepare cellulose nanocrystals

Gao

Guo

Liu

et al. 2018

Sci Rep

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Rice husks (RHs) as an agro-waste generated from rice production, while its application is limited. This study was designed to introduce a full utilization of rice husks, which extracted the phytochemical at first and then produced cellulose nanocrystals (CNCs) as the use of the residue. Furthermore, the phytochemicals extracted from rice husk was identified and its biological activity, including antioxidant activity, cellular antioxidant activity (CAA) and antiproliferative activity, had been detected as well. Results showed the bound fraction of rice husk had higher antioxidant than common fruit and grain. Free fraction of rice husk deserved to have further analysis in antiproliferative activity due to its low cytotoxicity. The CNCs produced by residue was using delignification process and acid hydrolysis treatments. The chemical composition of the residue obtained after phytochemical extraction was determined. CNCs morphological investigation was performed using an optical microscope and atomic force microscopy (AFM). Our strategy is to achieve a comprehensive utilization of rice husks with both economy and environment benefits.

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Effective dispersion of aqueous clay suspension using carboxylated nanofibrillated cellulose as dispersant

Abstract: Carboxylated nanofibrillated cellulose extracted from wood fibers was used as a green dispersant to effectively disperse clay particles in water.

Cited by 15 publications

References 46 publications

Flexible and Highly Sensitive Humidity Sensor Based on Cellulose Nanofibers and Carbon Nanotube Composite Film

Flexible and Highly Sensitive Humidity Sensor Based on Cellulose Nanofibers and Carbon Nanotube Composite Film

Steady-shear and viscoelastic properties of cellulose nanofibril–nanoclay dispersions

A full utilization of rice husk to evaluate phytochemical bioactivities and prepare cellulose nanocrystals

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